How to use SocketChannel in Java for network communication?

1. Description

SocketChannel represents the socket channel, and the instance is created through its static method.

SocketChannel is a subclass of SelectableChannel. If the blocking mode is not configured, the SocketChannel object defaults to blocking mode, and the open(SocketAddressremote) method actually blocks the opening of the server connection. Any I/O operation on SocketChannel is blocking.

2. Example

    public static SocketChannel open() throws IOException {
        return SelectorProvider.provider().openSocketChannel();
    }
 
    public static SocketChannel open(SocketAddress remote)
        throws IOException
    {
        // 1. ceate socket channel
        SocketChannel sc = open();
        try {
            // 2. connect channel's socket, blocking until connected or error
            sc.connect(remote);
        } catch (Throwable x) {
            try {
                sc.close();
            } catch (Throwable suppressed) {
                x.addSuppressed(suppressed);
            }
            throw x;
        }
        assert sc.isConnected();
        return sc;
    }

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